Exemple #1
0
/**
  * @brief  System Power Configuration
  *         The system Power is configured as follow : 
  *            + Regulator in LP mode
  *            + VREFINT OFF, with fast wakeup enabled
  *            + HSI as SysClk after Wake Up
  *            + No IWDG
  *            + Automatic Wakeup using RTC clocked by LSI (after ~4s)
  * @param  None
  * @retval None
  */
static void SystemPower_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable Ultra low power mode */
  HAL_PWREx_EnableUltraLowPower();
  
  /* Enable the fast wake up from Ultra low power mode */
  HAL_PWREx_EnableFastWakeUp();

  /* Select HSI as system clock source after Wake Up from Stop mode */
  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_StopWakeUpClock_HSI);
  
  /* Enable GPIOs clock */
  __GPIOA_CLK_ENABLE();
  __GPIOB_CLK_ENABLE();
  __GPIOC_CLK_ENABLE();
  __GPIOD_CLK_ENABLE();
  __GPIOH_CLK_ENABLE();

  /* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);

  /* Disable GPIOs clock */
  __GPIOA_CLK_DISABLE();
  __GPIOB_CLK_DISABLE();
  __GPIOC_CLK_DISABLE();
  __GPIOD_CLK_DISABLE();
  __GPIOH_CLK_DISABLE();
 
  /* Configure RTC */
  RTCHandle.Instance = RTC;
  /* Configure RTC prescaler and RTC data registers as follow:
  - Hour Format = Format 24
  - Asynch Prediv = Value according to source clock
  - Synch Prediv = Value according to source clock
  - OutPut = Output Disable
  - OutPutPolarity = High Polarity
  - OutPutType = Open Drain */
  RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
  RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
  RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
  RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
  RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  if(HAL_RTC_Init(&RTCHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
}
/**
  * @brief  This function configures the system to enter Sleep mode for
  *         current consumption measurement purpose.
  *         Sleep Mode
  *         ==========  
  *            - System Running at PLL (168MHz)
  *            - Flash 5 wait state
  *            - Instruction and Data caches ON
  *            - Prefetch ON   
  *            - Code running from Internal FLASH
  *            - All peripherals disabled.
  *            - Wakeup using EXTI Line (Key Button)
  * @param  None
  * @retval None
  */
void SleepMode_Measure(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  /* Configure all GPIO as analog to reduce current consumption on non used IOs */
  /* Enable GPIOs clock */
   __GPIOA_CLK_ENABLE();
   __GPIOB_CLK_ENABLE();
   __GPIOC_CLK_ENABLE();
   __GPIOD_CLK_ENABLE();
   __GPIOE_CLK_ENABLE();
   __GPIOH_CLK_ENABLE();

  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Pin = GPIO_PIN_All;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* Disable GPIOs clock */
   __GPIOA_CLK_DISABLE();
   __GPIOB_CLK_DISABLE();
   __GPIOC_CLK_DISABLE();
   __GPIOD_CLK_DISABLE();
   __GPIOE_CLK_DISABLE();
   __GPIOH_CLK_DISABLE();

  /* Configure Key Button */
  BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI);

  /* Suspend Tick increment to prevent wakeup by Systick interrupt. 
     Otherwise the Systick interrupt will wake up the device within 1ms (HAL time base) */
  HAL_SuspendTick();

  /* Request to enter SLEEP mode */
  HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
  
  /* Resume Tick interrupt if disabled prior to sleep mode entry */
  HAL_ResumeTick();

  /* Initialize LED6 */
  BSP_LED_Init(LED6);
  
  /* Turn LED6 On */
  BSP_LED_On(LED6);
  
  /* Inserted Delay */
  HAL_Delay(200);

}
Exemple #3
0
/**
  * @brief  Configure all GPIO's to AN to reduce the power consumption
  * @param  None
  * @retval None
  */
static void GPIO_ConfigAN(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  
  /* Configure all GPIO as analog to reduce current consumption on non used IOs */
  /* Enable GPIOs clock */
  __GPIOA_CLK_ENABLE();
  __GPIOB_CLK_ENABLE();
  __GPIOC_CLK_ENABLE();
  __GPIOD_CLK_ENABLE();
  __GPIOE_CLK_ENABLE();
  __GPIOF_CLK_ENABLE();
  __GPIOG_CLK_ENABLE();
  __GPIOH_CLK_ENABLE();
  __GPIOI_CLK_ENABLE();
  
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Pin = GPIO_PIN_All;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
  
  /* Disable GPIOs clock */
  __GPIOA_CLK_DISABLE();
  __GPIOB_CLK_DISABLE();
  __GPIOC_CLK_DISABLE();
  __GPIOD_CLK_DISABLE();
  __GPIOE_CLK_DISABLE();
  __GPIOF_CLK_DISABLE();
  __GPIOG_CLK_DISABLE();
  __GPIOH_CLK_DISABLE();
  __GPIOI_CLK_DISABLE();
}
Exemple #4
0
/**
  * @brief  System Power Configuration
  *         The system Power is configured as follow :
  *            + Regulator in LP mode
  *            + VREFINT OFF, with fast wakeup enabled
  *            + HSI as SysClk after Wake Up
  *            + No IWDG
  *            + Wakeup using EXTI Line (Key Button PC.13)
  * @param  None
  * @retval None
  */
static void SystemPower_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable Ultra low power mode */
    HAL_PWREx_EnableUltraLowPower();

    /* Enable the fast wake up from Ultra low power mode */
    HAL_PWREx_EnableFastWakeUp();

    /* Select HSI as system clock source after Wake Up from Stop mode */
    __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_StopWakeUpClock_HSI);

    /* Enable GPIOs clock */
    __GPIOA_CLK_ENABLE();
    __GPIOB_CLK_ENABLE();
    __GPIOC_CLK_ENABLE();
    __GPIOD_CLK_ENABLE();
    __GPIOH_CLK_ENABLE();

    /* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
    GPIO_InitStructure.Pin = GPIO_PIN_All;
    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStructure.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);

    /* Disable GPIOs clock */
    __GPIOA_CLK_DISABLE();
    __GPIOB_CLK_DISABLE();
    __GPIOC_CLK_DISABLE();
    __GPIOD_CLK_DISABLE();
    __GPIOH_CLK_DISABLE();

}
Exemple #5
0
/**
  * @brief  Configure the system for power optimization
  *
  * @note	This API configures the system to be ready for low power mode
  * 		- Unused GPIO in Analog mode
  * 		- Fast Wakeup
  * 		- Verefint disabled in low power mode
  * 		- FLASH in low power mode
  *
  * @param  None
  * @retval None
  */
void SystemPower_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /**
  * Disable FLASH in SLEEP Mode
  */
  __HAL_FLASH_SLEEP_POWERDOWN_ENABLE();

  //SO: TO BE VERIFIED FOR L4
  /* Enable Power Clock */
  __HAL_RCC_PWR_CLK_ENABLE();
  
  /**
  * Enable Ultra low power and Fast wakeup as vrefint is not used in that project
  */
  //SO: TO BE VERIFIED FOR L4 (these APIs are not available for L4)
  //HAL_PWREx_EnableUltraLowPower();
  //HAL_PWREx_EnableFastWakeUp();

  /*
  * Select HSI as system clock source after Wake Up from Stop mode
  */
    //__HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_StopWakeUpClock_MSI); //SO: TO BE VERIFIED FOR L4 (why not this?)
  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_StopWakeUpClock_HSI);
  
  /*
  * Disable all GPIOs clock in SLEEP mode
  */
#if (JTAG_SUPPORTED == 0)
  __GPIOA_CLK_SLEEP_DISABLE();
#endif
  __GPIOB_CLK_SLEEP_DISABLE();
  __GPIOC_CLK_SLEEP_DISABLE();
  __GPIOD_CLK_SLEEP_DISABLE();
  __GPIOE_CLK_SLEEP_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOF_CLK_SLEEP_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOG_CLK_SLEEP_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOH_CLK_SLEEP_DISABLE();
  
  /*
  * Enable GPIOs clock
  */
  __GPIOA_CLK_ENABLE();
  __GPIOB_CLK_ENABLE();
  __GPIOC_CLK_ENABLE();
  __GPIOD_CLK_ENABLE();
  __GPIOE_CLK_ENABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOF_CLK_ENABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOG_CLK_ENABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOH_CLK_ENABLE();

  /*
  * Configure all GPIO port pins in Analog mode with no pull
  */
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Speed = GPIO_SPEED_HIGH; //SO: TO BE VERIFIED FOR L4
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStructure); //SO: TO BE VERIFIED FOR L4
  HAL_GPIO_Init(GPIOF, &GPIO_InitStructure); //SO: TO BE VERIFIED FOR L4
  HAL_GPIO_Init(GPIOG, &GPIO_InitStructure); //SO: TO BE VERIFIED FOR L4
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
  
#if (JTAG_SUPPORTED == 1)
  GPIO_InitStructure.Pin = (GPIO_PIN_All ^ (GPIO_PIN_13 | GPIO_PIN_14));
#endif
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
  
  /*
  * Disable GPIOs clock
  */
  __GPIOA_CLK_DISABLE();
  __GPIOB_CLK_DISABLE();
  __GPIOC_CLK_DISABLE();
  __GPIOD_CLK_DISABLE();
  __GPIOE_CLK_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOF_CLK_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOG_CLK_DISABLE(); //SO: TO BE VERIFIED FOR L4
  __GPIOH_CLK_DISABLE();
  
  return;
}
/**
  * @brief  System Power Configuration
  *         The system Power is configured as follow : 
  *            + Regulator in LP mode
  *            + VREFINT OFF, with fast wakeup enabled
  *            + HSI as SysClk after Wake Up
  *            + No IWDG
  *            + Wakeup using EXTI Line (Key Button PC.13)
  * @param  None
  * @retval None
  */
static void SystemPower_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable Ultra low power mode */
  HAL_PWREx_EnableUltraLowPower();
  
  /* Enable the fast wake up from Ultra low power mode */
  HAL_PWREx_EnableFastWakeUp();

  /* Select HSI as system clock source after Wake Up from Stop mode */
  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_StopWakeUpClock_HSI);
  
  /* Enable GPIOs clock */
  
  __GPIOA_CLK_ENABLE();
  __GPIOB_CLK_ENABLE();
  __GPIOC_CLK_ENABLE();
  __GPIOD_CLK_ENABLE();
  __GPIOH_CLK_ENABLE();
  

  /* Configure GPIO Pins: PA0,PA1,PA2,PA3,PA4,PA5,PA8,PA9,PA11,PA12,PA13,\
  PA14,PA15 in Analog Input mode (floating input trigger OFF) */
  
  /* PA6: SDO, PA7: SDI, PA10 :SDn  are not put in analog mode  */
    
  GPIO_InitStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | \
    GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_9 | GPIO_PIN_11 | \
      GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
  
  /* Configure GPIO Pins: PB0,PB1,PB2,PB4,PB5,PB7,PB8,PB9,PB10,PB11,PB12,PB13,\
  PB14,PB15 in Analog Input mode (floating input trigger OFF) */
  
  /*PB6: CSn, PB3: SCLK are not put in analog mode  */
  
  GPIO_InitStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_4 | \
    GPIO_PIN_5 | GPIO_PIN_7 | GPIO_PIN_8 | GPIO_PIN_9 | GPIO_PIN_10 | \
      GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  
  /* Configure GPIO Pins: PC0,PC1,PC2,PC3,PC4,PC5,PC6,PC8,PC9,PC10,PC11,PC12,\
  PC13,PC14,PC15 in Analog Input mode (floating input trigger OFF) */
  
  /*PC7: GPIO3, PC13: Push Button are not put in analog mode  */
  
  GPIO_InitStructure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | \
    GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_8 | GPIO_PIN_9 | \
      GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_14 | GPIO_PIN_15;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  /* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;

  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);

  /* Disable GPIOs clock */
  __GPIOA_CLK_DISABLE();
  __GPIOB_CLK_DISABLE();
  __GPIOC_CLK_DISABLE();
  __GPIOD_CLK_DISABLE();
  __GPIOH_CLK_DISABLE();
  
}
Exemple #7
0
void GPIO_Clock_Put(GPIO_ClockProviderTypeDef* clk, GPIO_TypeDef* gpiox, uint32_t Pin)
{
	int index;
	uint16_t prev, curr;	
	
	if (gpiox == GPIOA)
	{
		index = 0;
	}
	else if (gpiox == GPIOB)
	{
		index = 1;
	}
	else if (gpiox == GPIOC)
	{
		index = 2;
	}
	else if (gpiox == GPIOD)
	{
		index = 3;
	}
	else if (gpiox == GPIOE)
	{	
		index = 4;
	}
	else if (gpiox == GPIOF)
	{
		index = 5;
	}
	else if (gpiox == GPIOG)
	{
		index = 6;
	}
	else if (gpiox == GPIOH)
	{
		index = 7;
	}
	else 
	{
		return;
	}
	
	prev = clk->bits[index];
	curr = (clk->bits[index] &= ~Pin);

	if (prev != 0 && curr == 0)
	{
		switch (index)
		{
			case 0:
				__GPIOA_CLK_DISABLE();
				break;
			case 1:
				__GPIOB_CLK_DISABLE();
				break;
			case 2:
				__GPIOC_CLK_DISABLE();
				break;
			case 3:
				__GPIOD_CLK_DISABLE();
				break;
			case 4:
				__GPIOE_CLK_DISABLE();
				break;
			case 5:
				__GPIOF_CLK_DISABLE();
				break;
			case 6:
				__GPIOG_CLK_DISABLE();
				break;
			case 7:
				__GPIOH_CLK_DISABLE();
				break;
			default:
				break;
		}
	}
}
/**
  * @brief  This function configures the system to enter Stop mode with RTC 
  *         clocked by LSE or LSI  for current consumption measurement purpose.
  *         STOP Mode with RTC clocked by LSE/LSI
  *         =====================================   
  *           - RTC Clocked by LSE or LSI
  *           - Regulator in LP mode
  *           - HSI, HSE OFF and LSI OFF if not used as RTC Clock source
  *           - No IWDG
  *           - FLASH in deep power down mode
  *           - Automatic Wakeup using RTC clocked by LSE/LSI (~20s)
  * @param  None
  * @retval None
  */
void StopMode_Measure(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  
  /* Configure all GPIO as analog to reduce current consumption on non used IOs */
  /* Enable GPIOs clock */
   __GPIOA_CLK_ENABLE();
   __GPIOB_CLK_ENABLE();
   __GPIOC_CLK_ENABLE();
   __GPIOD_CLK_ENABLE();
   __GPIOE_CLK_ENABLE();
   __GPIOH_CLK_ENABLE();

  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Pin = GPIO_PIN_All;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* Disable GPIOs clock */
   __GPIOA_CLK_DISABLE();
   __GPIOB_CLK_DISABLE();
   __GPIOC_CLK_DISABLE();
   __GPIOD_CLK_DISABLE();
   __GPIOE_CLK_DISABLE();
   __GPIOH_CLK_DISABLE();
 
  RTCHandle.Instance = RTC;
    
  /* Configure RTC prescaler and RTC data registers as follow:
  - Hour Format = Format 24
  - Asynch Prediv = Value according to source clock
  - Synch Prediv = Value according to source clock
  - OutPut = Output Disable
  - OutPutPolarity = High Polarity
  - OutPutType = Open Drain */ 
  RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
  RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
  RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
  RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
  RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  
  if(HAL_RTC_Init(&RTCHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
  
  /*## Configure the Wake up timer ###########################################*/
  /*  RTC Wakeup Interrupt Generation:
      Wakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSI))
      Wakeup Time = Wakeup Time Base * WakeUpCounter 
                  = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSI)) * WakeUpCounter
      ==> WakeUpCounter = Wakeup Time / Wakeup Time Base

      To configure the wake up timer to 20s the WakeUpCounter is set to 0xA017:
        RTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16 
        Wakeup Time Base = 16 /(~32.768KHz) = ~0,488 ms
        Wakeup Time = ~20s = 0,488ms  * WakeUpCounter
        ==> WakeUpCounter = ~20s/0,488ms = 40983 = 0xA017 */
    /* Disable Wake-up timer */
  if(HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
  
  HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0xA017, RTC_WAKEUPCLOCK_RTCCLK_DIV16);

  /* FLASH Deep Power Down Mode enabled */
  HAL_PWREx_EnableFlashPowerDown();

  /* Enter Stop Mode */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

  /* Configures system clock after wake-up from STOP: enable HSE, PLL and select 
  PLL as system clock source (HSE and PLL are disabled in STOP mode) */
  SYSCLKConfig_STOP();
  
  /* Disable Wake-up timer */
  if(HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
}